\documentclass{article}
% \usepackage[top=1in,bottom=1in,left=1in,right=1in,includehead,includefoot,letterpaper]{geometry}
\usepackage{listings}
\usepackage[parfill]{parskip}
\usepackage[usenames,dvipsnames]{color}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage[scaled]{beramono}
\usepackage{amsmath, amsthm, amssymb}
% \usepackage{concmath}

% ==========
% = colors =
% ==========
\definecolor{LightGray}{gray}{.5}
\definecolor{LighterGray}{gray}{.75}
\definecolor{IdentifierGray}{gray}{.2}

% ======================
% = listing appearance =
% ======================
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basicstyle=\footnotesize\ttfamily,
keywordstyle=\color{MidnightBlue},
commentstyle=\color{LightGray}\itshape,
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numberstyle=\tiny\ttfamily\color{LighterGray},
numbersep=10px,
breaklines=true,
breakatwhitespace=true,
showstringspaces=false,
frame=single
}

\begin{document}
\section{Classical Planning Overview}
\subsection{Background}
\input{background}

\subsection{PDDL}
\input{pddl}

\subsection{FF Planner}
\input{ff}

\subsection{Planning Domain Examples}\label{sub:planning_domain_examples}
\input{domains}

\bibliographystyle{abbrv}
\bibliography{biblio.bib}
\end{document}
